Harmony OS - Java SwipeGestureManager

MainAbility.java

package com.fs.uiapplication;

import com.fs.uiapplication.slice.*;
import ohos.aafwk.ability.Ability;
import ohos.aafwk.content.Intent;
import ohos.multimodalinput.event.TouchEvent;

public class MainAbility extends Ability implements SwipeListener{

    private SwipeManager swipeManager = new SwipeManager(this);

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setMainRoute(MainAbilitySlice.class.getName());

        setSwipeToDismiss(false);
    }

    @Override
    protected boolean onTouchEvent(TouchEvent event) {
        this.swipeManager.manageSwipe(event);
        return super.onTouchEvent(event);
    }

    @Override
    public void onSwipeLeft() {

    }

    @Override
    public void onSwipeRight() {

    }

    @Override
    public void onSwipeTop() {

    }

    @Override
    public void onSwipeBottom() {

    }
}

SwipeManager.java

package com.fs.uiapplication;

import ohos.multimodalinput.event.MmiPoint;
import ohos.multimodalinput.event.TouchEvent;

public class SwipeManager {
    private final int LEFT = 150;
    private final int RIGHT = 300;
    private final int VERTICAL_THRESHOLD = 200;

    private int LAST_DRAG = -1;
    private final int D_LEFT = 0;
    private final int D_RIGHT = 1;
    private final int D_TOP = 2;
    private final int D_BOTTOM = 3;

    private SwipeListener listener = null;

    public SwipeManager(SwipeListener listener) {
        this.listener = listener;
    }

    public void manageSwipe(TouchEvent event) {
        if (event.getPhase() == TouchEvent.PHASE_MOVE) {
            MmiPoint point = event.getPointerScreenPosition(event.getIndex());

            if (point.getX() >= RIGHT) {
                LAST_DRAG = D_RIGHT;
            } else if (point.getX() <= LEFT) {
                LAST_DRAG = D_LEFT;
            } else if (point.getY() >= VERTICAL_THRESHOLD) {
                LAST_DRAG = D_BOTTOM;
            } else {
                LAST_DRAG = D_TOP;
            }
        } else if (event.getPhase() == TouchEvent.PHASE_COMPLETED) {
            switch (LAST_DRAG){
                case D_LEFT:
                    this.listener.onSwipeLeft();
                    break;
                case D_RIGHT:
                    this.listener.onSwipeRight();
                    break;
                case D_TOP:
                    this.listener.onSwipeTop();
                    break;
                case D_BOTTOM:
                    this.listener.onSwipeBottom();
                    break;
            }
            LAST_DRAG = -1;
        }
    }
}

interface SwipeListener {
    void onSwipeLeft();
    void onSwipeRight();
    void onSwipeTop();
    void onSwipeBottom();
}